Injection questions

hey guys, i know how to inject but had a question, i do this basically:

a ) draw the gear
b) wipe area with an alcahol wipe (pre injection)
c) make the initial piercing
d) get the needle further down, whilst still being able to see a bit of it, incase it snaps...
e) aspirate

then if no blood carry on, if blood i pull out

i was wondering though, i heard that some people have gone right the way through veins? and when you hot a vein you get blood, obviously, but well just a dumb question i guess, doesnt it hurt like **** when u hit a vein?

ahh yes i did mean to mention change pin
can u help clear up the whole air thing? u dont wanna inject air into you obviously, so u aspire and if theres a bubble then what? as some places say its a vacuum which is ok etc, which makes me wonder, how would u know when it is just air

You can inject an incredible amount of air into yourself before you start to get large problem, and the whole air inject situation is primarily aimed at an air embolism which is air that travels up to your lungs and is very bad for you. But I think you could theoretically put like 3-5cc of air in your a$$ and still be fine. Don't worry about that little bubble that occurs upon aspiration.